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            <span class="bold">
              <strong>I can't compile and run
                multithreaded applications.</strong>
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            <p> 
                Special compile-time flags are required when
                compiling threaded applications on Linux. If you are
                compiling a threaded application, you must compile
                with the _REENTRANT flag:
            </p>
            <pre class="programlisting">cc -D_REENTRANT ...</pre>
            <p>
                The Berkeley DB library will automatically build
                with the correct options.
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              <strong>I see database corruption when
                accessing databases.</strong>
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            <p> 
                Some Linux filesystems do not support POSIX
                filesystem semantics. Specifically, ext2 and early
                releases of ReiserFS, and ext3 in some configurations,
                do not support "ordered data mode" and may insert
                random data into database or log files when systems
                crash. Berkeley DB files should not be placed on a
                filesystem that does not support, or is not configured
                to support, POSIX semantics. 
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              <strong>What scheduler should I
                use?</strong>
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            <p> 
                In some Linux kernels you can select schedulers,
                and the default is the "anticipatory" scheduler. We
                recommend not using the "anticipatory" scheduler for
                transaction processing workloads. 
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